I'm almost afraid to say that I have no problems with my new 900. I have 2 weeks of jobs under my belt and all works perfectly. I haven't tried everything because I play arranger style only, but I do use all the variations, ots, registrations, mixing, etc.
This is scary news though.........
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Live: Korg PA4X/Zed 6FX/EV Everse 8s/Senn 935/K&M stand
Studio: Korg PA4X/Yamaha DGX670/Yamaha PSR SX900/Boss BR900CD/Tascam DP24SD/MTM Iloud/Senn 935/K&M stand/Shure SM57/Sony C80 (2)/Blue Encore 300